Improvement in mottntotg writing-slates



' diluita gottes @mm @illico GEORGE F. BOWMANQOF CLEVELAND, OHIO.

Laim Pam.: No. 98,458, dated December 2s, 1869.

IMPROVEMENT MQUNTING WRITINGSLATES.

The Scheule referred to in these Letters Patent and making part of thelan-1a Figure 2 represents u rc1-tieni transverse section of the sume.; und

Figure 3 represents n view in perspective of the me# tullio slate-holder. f

My irnproveuents consist in securing, within u portfolio, n common framed siste by menus oi' :t metallic holder, to the angularproiecting ends or sides or buck ot.' which the slate is secured, and by the sides of which it is supported throughoutits lengt-h, whichA also forms r rigid buck for the portfolio, und a rigid sent for the -slatemvhereby the. lutter may be removed iu case of breakage, und replace-d by another with fmrility,l alud combining the use ot' a, common cheap framed slate with a portfolio.

, In thc accompanying drawings- A represents the porfollolecvcs or covers, united t the buck in the usual manner.

The buck of this portfolio is provided with a metallic supporting und holding-trough, B, having at erich funi u projecting enr, C.

This trough is open at one side to form the seat or receptacle for the shite D, and is secured between the buck ofthe portfolio, and en inner lining'of morocco (l. glued Ato the inner sides ofthe trough B, and to the inner sides of the portlblio-covers A, so as to be united securely therewith, iu such manner that the sides of said metallic trough will form n, rigid back, und. the hinges ot' the covers, by which the sides which form thc hinges will embrace und support the frame of the slate throughout its length.

. in order to prevent the hinges of the back of the portolioiiom being cut out by the edges of the sides of the metallic holder, I bend them over 'so as to form convex bearing-surfaces b at. the junction of the morocco buck with the sides ot' the metallic support B,

which also has the additional advantage of forming a.

bracing-rib throughout its lengt-h. It. is obvious that this is n. veryiinportant improvement, and greatly increases the durability of the portfolio.

The eers C, by which the frame E of the slate is secured to the portfolio, ore bent at right angles to the metallic trough B, :it each end thereof, and project c. sufficient distance beyond the hinges of the covers to embrace the inner top und bottom corners 0f the slate-frame E, in such menne-r as to form arigid support to the slate in the direction of its length, and

confine it securely wit-hin the metallic holder B.

Ihcse project-ing eers C muy be attached to the frame of the slate by screws c, to admit of its removal therefrom, whenever, from any cause, it may be necessary to do so, und its replacement by another with facility. They muy also be oountersunk in the ends ofthe slate-frame, so os to make a. neat finish.

By meansof a portfolio thus constructed, e cheap common framed slate may be used, possessing all the. advantages of u cover, to protect the figures thereon, having the appearance of u book, and muy be used without noise or defacing thedesk.

This l.trrmigement will also admit of the frame of the slate being made much lighter and thinner than heretofore.

l-Iuving thus described myinvention,

I claim a. common framed slate, secured within a. portfolio by ineens of metallic end ears '0, and supported along its entire length by n metallic back, B, itt-ed thereto, umde in one. piece with the ears, and

constituting the seat or receptacle for the slitte-traine" E, und the buck of the portfolio A, so that the slut-emzty be removed when necessary, as described.

- GEORGE F. BOWMAN.

Witnesses GEO. T. CHAPMAN, SAML. E. W1LL1AMsoN. 

